\documentclass{article}
\usepackage[usenames]{color}
\usepackage{gastex}

\begin{document}

% Loop width and height

\begin{center}
  \begin{picture}(118,28)(-7,-11)
%     \put(-7,-11){\framebox(118,28){}}
    \node(A)(0,0){1}
    \drawloop[loopwidth=4](A){}
    \drawloop[loopwidth=6](A){}
    \drawloop[loopwidth=8](A){}
    \drawloop[loopwidth=10](A){}
    \drawloop[loopwidth=12](A){}
    
    \node(B)(20,0){2}
    \drawloop[loopheight=4](B){}
    \drawloop[loopheight=6](B){}
    \drawloop[loopheight=8](B){}
    \drawloop[loopheight=10](B){}
    \drawloop[loopheight=12](B){}
    
    \node(C)(40,0){3}
    \drawloop[loopdiam=4](C){}
    \drawloop[loopdiam=6](C){}
    \drawloop[loopdiam=8](C){}
    \drawloop[loopdiam=10](C){}
    \drawloop[loopdiam=12](C){}
    
    \node[Nw=4,Nh=4](D)(70,0){4}
    \drawloop[loopangle=0](D){}
    \drawloop[loopangle=90](D){}
    \drawloop[loopangle=180](D){}
    \drawloop[loopangle=270](D){}
    
    \node[Nw=4,Nh=4](E)(100,0){5}
    \drawloop[loopwidth=6,loopangle=0](E){}
    \drawloop[loopwidth=6,loopangle=90](E){}
    \drawloop[loopwidth=6,loopangle=180](E){}
    \drawloop[loopwidth=6,loopangle=270](E){}
  \end{picture}
\end{center}

% Peterson automaton

\begin{center}
\begin{picture}(85,33)(-20,-28)
%   \put(-20,-28){\framebox(85,33){}}
  \gasset{Nadjust=w,Nadjustdist=2,Nh=6,Nmr=1}
  \node[Nmarks=i](A)(0,0){idle}
  \node(B)(50,0){wait}
  \node(C)(50,-20){wait}
  \node[Nmarks=r](D)(0,-20){critical}
 
  \drawedge(A,B){req1:=true}
  \drawedge(B,C){turn:=2}
  \drawedge[syo=-1,eyo=-1](C,D){turn=1?}
  \drawedge[syo=1,eyo=1,ELside=r](C,D){req2=false?}
  \drawedge(D,A){req1:=false}
\end{picture}
\end{center}

% Petri Net and offsets

\begin{center}
\begin{picture}(110,50)(-25,-24)
%   \put(-25,-24){\framebox(110,50){}}
  \node(A)(-20,-7){$\bullet \bullet$}
  \node(B)(-20, 7){$\bullet$}
  \node(C)( 20,-7){}
  \node(D)( 20, 7){}
  \gasset{Nw=.7,Nh=7,Nmr=0,fillgray=0} % black rectangle
  \gasset{ExtNL=y,NLdist=1,NLangle=90} % external label above the node
  \node(Ta)(0,  0){$a$}
  \node(Tb)(0,-20){$b$}
  \node(Tc)(0, 20){$c$}
  
  \gasset{ELdistC=y,ELdist=0}
  \drawedge[ELside=r,eyo=-1](A,Ta){\colorbox{white}{2}}\drawedge[eyo=1](B,Ta){}
  \drawedge[syo=-1](Ta,C){}\drawedge[syo=1](Ta,D){}
  {\gasset{curvedepth=4}\drawedge(C,Tb){}\drawedge(Tb,A){\colorbox{white}{2}}}
  {\gasset{curvedepth=-4}\drawedge(D,Tc){}\drawedge[syo=1](Tc,B){}}
  \drawbpedge[syo=-1,ELpos=70](Tc,-160,15,D,170,20){\colorbox{white}{3}}
% offsets
  \put(40,-15){\unitlength=1.2mm
    \gasset{Nmr=0,Nfill=y,fillgray=0}
    \node[Nw= 1,Nh=10](B)(0,20){}
    \node[Nw= 1,Nh=10](C)(30,20){}
    \node[Nw=10,Nh= 1](D)(15,0){}
    \drawedge[syo=3,eyo=3,curvedepth=3](B,C){}
    \drawedge[syo=1,eyo=1](B,C){}
    \drawedge[syo=-1,eyo=-1](C,B){}
    \drawbpedge[syo=4,eyo=4](B,165,30,C,15,30){}
    \drawbpedge[syo=-3,exo=-3](B,0,10,D,90,10){}
    \drawbpedge[syo=-3](C,180,10,D,90,10){}
    \drawbpedge[sxo=3,eyo=-5](D,90,10,C,-90,10){}
    \drawloop[sxo=-3,loopdiam=4,loopangle=-90](D){}
    \drawloop[sxo= 3,loopdiam=4,loopangle=-90](D){}
  }
\end{picture}
\end{center}

% Diagram

\begin{center}
\begin{picture}(105,28)(-33,-3)
%   \put(-33,-3){\framebox(105,28){}}
  \gasset{Nframe=n,Nadjust=w,Nh=6,Nmr=0}
  \node(L)(0,20){$\mathcal{L}$}
  \node(F)(30,20){$[F^V\to F]$}
  \node(O1)( 20,0){$(\mathcal{P}(R)^V\to 2^{M\times\mathcal{P}(R)})$}
  \node(O2)(-20,0){$(\mathcal{P}(R)^V\to 2^M)$}
  \node(B1)( 60,0){$(\mathcal{P}(R)^V\to F)$}

  \drawedge[ELpos=40](L,F){$[\![ -]\!]$}
  \drawedge(L,O1){$X_F$}
  \drawedge(F,O1){$\chi$}
  \drawedge[ELside=r](L,O2){$X_M$}
  \drawedge[ELpos=55](O1,B1){$\sqcup$}
  \drawedge[ELside=r,ELpos=53](O1,O2){$\mathrm{Re}$}
\end{picture}
\end{center}

% and more ...

\begin{center}
\begin{picture}(120,52)(-35,-37)
%   \put(-35,-37){\framebox(120,52){}}
  \node[Nw=16,linecolor=Yellow,fillcolor=Yellow](A)(-20,0){initial}
  \imark[iangle=200,linecolor=Peach](A)
  \node[Nmr=0,Nw=14,fillgray=0.85,
        dash={1}0](B)( 20,0){}
  \fmark[flength=10,fangle=-30,dash={3 1 1 1}0](B)
  \node[Nadjust=wh,Nadjustdist=2,Nmr=3,Nmarks=r,linecolor=Green](C)(60,-20){$\left(
    \begin{array}{ccc}
    	 2 &  1 & 0  \\
    	-1 &  0 & 1  \\
    	 0 & -1 & 2
    \end{array}
    \right)$}
  \rmark[linecolor=Green,rdist=1.4](C)
  
  \drawedge[curvedepth=5,linecolor=Red](A,B){}
  \drawedge[ELside=r,ELpos=35](A,B){straight}
  \drawedge[curvedepth=-25,ELside=r,dash={1.5}0](A,B){far}
  \drawloop[ELpos=75, loopangle=150, dash={0.2 0.5}0](A){loopCW}
  \drawloop[loopCW=n,ELside=r,loopangle=30,dash={3 1.5}{1.5}](B){loopCCW}
  \drawqbpedge[ELside=r,ELdist=0,dash={4 1 1 1}0](B,-90,C,180){qbpedge}
  \drawloop[ELpos=70,loopangle=0](C){$b / 01$}
  \drawloop[loopCW=n,ELpos=75,ELside=r,loopangle=-90,sxo=6](C){$a / 01$}
  \drawloop[ELpos=75,loopangle=-90,sxo=-6](C){$b / 10 $}
  \drawloop[loopangle=50](C){$b / 01$}
  \drawloop[ELpos=75,loopangle=148](C){$b / 01$}
\end{picture}
\end{center}

% Edges

\begin{center}
\begin{picture}(120,60)(-32,-14)
%   \put(-32,-14){\framebox(120,60){}}
  \node(A)(10,0){}\node(B)(40,0){}
  \drawedge(A,B){straight}
  \drawedge[curvedepth=8](A,B){positive curve depth}
  \drawedge[curvedepth=-8,ELside=r](A,B){negative curve depth}
  \drawloop[loopangle=180](A){180}
  \drawloop[loopangle=0](B){0}
 
  \node(A)(-15,30){}\node(B)(15,30){}
  \drawqbedge(A,-15,50,B){qbedge}
  \drawbcedge(A,-20,10,B,20,10){bcedge}
  \drawloop[loopangle=210](A){210}
  \drawloop[loopangle=90,loopCW=n,ELside=r](B){90}
 
  \node(A)(40,30){}\node(B)(70,30){}
  \drawbpedge[ELpos=30,ELdist=0](A,45,20,B,225,20){bpedge}
  \drawbpedge[ELpos=30,ELside=r](A,210,30,B,-30,30){30}
  \drawbpedge[ELpos=70,ELside=r](A,210,30,B,-30,30){70}
  \drawloop[loopdiam=5,loopangle=120,ELpos=60](A){smaller}
  \drawloop[loopdiam=10,loopangle=30,ELpos=30](B){larger}
\end{picture}
\end{center}

% Nodes, colors, etc...

\begin{center}
\begin{picture}(105,70)(-15,-65)
%   \put(-15,-65){\framebox(105,70){}}
  \node[Nmarks=if](A)(0,0){1}
  \node[Nw=15,Nh=6,Nmr=0](A)(25,0){rectangle}
  \node[Nw=12,Nh=6,Nmr=3](A)(50,0){oval}

  \node(B)(0,-15){Nadjust=n}
  \node[Nadjust=w,Nmr=2](B)(25,-15){Nadjust=w}
  \node[Nadjust=wh,Nmr=1](B)(50,-15){Nadjust=wh}
  
  \gasset{Nadjust=w,Nadjustdist=3}
  \node[Nmarks=i,iangle=210,ilength=5](C)(0,-30){imark}
  \imark[iangle=150,ilength=10,linecolor=Red](C)
  \node[Nmarks=f,fangle=30,flength=5,linecolor=Green](C)(25,-30){fmark}
  \fmark[fangle=-30,flength=10,linecolor=Blue](C)
  \node(C)(50,-30){rmark}
  \rmark[linecolor=Red](C)\rmark[rdist=1.4,linecolor=Green](C)
  \node[Nmarks=ifr](C)(75,-30){all}

  \node(D)(0,-45){framed}
  \node[Nframe=n,fillcolor=Yellow](D)(25,-45){filled}
  \node[fillcolor=Yellow](D)(50,-45){both}
  \node[fillcolor=Yellow,
        linecolor=Green](D)(75,-45){}

  \node[linewidth=0.5](E)(0,-60){Thick}
  \node[linewidth=1,linegray=0.8](E)(25,-60){Gray}
  \node[dash={1.5}0](E)(50,-60){Dash}
  \node[dash={4 1 1 1}0,linecolor=Red](E)(75,-60){More dash}
\end{picture}
\end{center}

% Arrows

\begin{center}\unitlength=0.85mm
\begin{picture}(60,40)(-30,-17)
% \put(-30,-17){\framebox(60,40){}}
  \drawline[AHangle=30,AHLength=3,AHlength=0,
            ATnb=1,ATangle=90,ATLength=2,ATlength=0](-15,20)(15,20)
  \drawline[AHnb=2,ATnb=2](-15,15)(15,15)
  \drawline[AHnb=2,AHangle=30,AHLength=3,AHlength=0,AHdist=1,
            ATnb=2,ATangle=30,ATLength=3,ATlength=0,ATdist=1](-15,10)(15,10)
  \drawline[AHnb=1,AHangle=30,AHLength=3,AHlength=1,
            ATnb=1,ATangle=140,ATLength=3,ATlength=1.5](-15,5)(15,5)
  \drawline[AHnb=2,AHangle=30,AHLength=3,AHlength=0,AHdist=1,
            ATnb=2,ATangle=150,ATLength=3,ATlength=0,ATdist=1](-15,0)(15,0)
  \node(A)(-15,-10){}\node(B)( 15,-10){}
  \drawbpedge[AHnb=6,ATnb=6](A,60,25,B,240,25){}
  \gasset{AHnb=1,AHangle=30,AHLength=3,AHlength=0,
          ATnb=1,ATangle=30,ATLength=3,ATlength=0}
  \drawloop[loopangle=180](A){}
  \gasset{AHnb=3,AHangle=30,AHLength=3,AHlength=1.5,AHdist=1.8,
          ATnb=3,ATangle=30,ATLength=3,ATlength=1.5,ATdist=1.8}
  \drawloop[loopangle=0](B){}
\end{picture}
% \end{center}
% 
% % Node label
% 
% \begin{center}
\begin{picture}(80,40)(-20,-20)
%   \put(-20,-20){\framebox(80,40){}}
  \node[Nh=30,Nw=30,Nmr=15](D)(0,0){}
  \gasset{ExtNL=y,NLdist=1,AHnb=0,ilength=-2}
  \nodelabel[NLangle=  0](D){3}  \imark[iangle=  0](D)
  \nodelabel[NLangle= 30](D){2}  \imark[iangle= 30](D)
  \nodelabel[NLangle= 60](D){1}  \imark[iangle= 60](D)
  \nodelabel[NLangle= 90](D){12} \imark[iangle= 90](D)
  \nodelabel[NLangle=120](D){11} \imark[iangle=120](D)
  \nodelabel[NLangle=150](D){10} \imark[iangle=150](D)
  \nodelabel[NLangle=180](D){9}  \imark[iangle=180](D)
  \nodelabel[NLangle=210](D){8}  \imark[iangle=210](D)
  \nodelabel[NLangle=240](D){7}  \imark[iangle=240](D)
  \nodelabel[NLangle=270](D){6}  \imark[iangle=270](D)
  \nodelabel[NLangle=300](D){5}  \imark[iangle=300](D)
  \nodelabel[NLangle=330](D){4}  \imark[iangle=330](D)
  
  \node[Nh=30,Nw=30,Nmr=15](B)(40,0){}
  \gasset{ExtNL=n,NLdist=13}
  \nodelabel[NLangle=  0](B){3}
  \nodelabel[NLangle= 30](B){2}
  \nodelabel[NLangle= 60](B){1}
  \nodelabel[NLangle= 90](B){12}
  \nodelabel[NLangle=120](B){11}
  \nodelabel[NLangle=150](B){10}
  \nodelabel[NLangle=180](B){9}
  \nodelabel[NLangle=210](B){8}
  \nodelabel[NLangle=240](B){7}
  \nodelabel[NLangle=270](B){6}
  \nodelabel[NLangle=300](B){5}
  \nodelabel[NLangle=330](B){4}
\end{picture}
\end{center}

% Nodes whose shape is a regular polygon

\begin{center}
\begin{picture}(120,30)(0,0)
%   \put(0,0){\framebox(120,30){}}
  \rpnode[polyangle=90,Nmarks=i,iangle=-90](A)(5,14)(3,5){A}
  \rpnode[arcradius=2,Nmarks=r](B)(35,17)(6,10){B}
  \nodelabel[ExtNL=y,NLangle=30,NLdist=0.5](B){B}
  \nodelabel[ExtNL=y,NLangle=60,NLdist=0.5](B){B}
  \rpnode[arcradius=2,polyangle=90](C)(70,12)(5,7){C}
  \imark[iangle=198](C)\fmark[fangle=18](C)
  \rpnode[Nmarks=fr,fangle=45](D)(105,15)(4,7){D}
  \drawloop(A){$a$}
  \drawloop[loopangle=90](C){$c$}
  \drawloop[loopangle=-45](D){$d$}
  \drawedge(A,B){$x$}
  \drawbpedge(B,-30,30,C,140,30){$y$}
  \drawqbpedge(C,37,D,83){$z$}
  \drawedge[curvedepth=14,ELside=r](D,A){}
\end{picture}
\end{center}

% polygons and closed curves

\begin{center}
\begin{picture}(120,40)(0,0)
%   \put(0,0){\framebox(120,40){}}
  \put(3,3){ 
    \unitlength=8mm
    \drawpolygon[fillcolor=Green,Nframe=n,arcradius=.3](0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
    \drawpolygon(0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
    \drawccurve[linecolor=Red](0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
  }
  \put(55,20){ 
    \unitlength=1.4mm
    \drawpolygon[fillcolor=Green,Nframe=n,arcradius=2](-10,-10)(10,10)(-10,10)(10,-10)
    \drawpolygon(-10,-10)(10,10)(-10,10)(10,-10)
    \drawccurve[linecolor=Red](-10,-10)(10,10)(-10,10)(10,-10)
  }
  \put(100,19){ 
    \unitlength=20mm
    \drawccurve[fillcolor=Yellow,linecolor=Red](0,1)(0.59,-0.8)(-0.95,0.3)(0.95,0.3)(-0.59,-0.8)
    \drawpolygon(0,1)(0.59,-0.8)(-0.95,0.3)(0.95,0.3)(-0.59,-0.8)
  }
\end{picture}
\end{center}

% curves

\begin{center}
\begin{picture}(120,40)(0,0)
%   \put(0,0){\framebox(120,40){}}
  \put(2,3){ 
    \unitlength=8mm
    \drawline[AHnb=0](0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
    \drawcurve[linecolor=Red,AHnb=0](0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
  }
  \put(55,16){ 
    \unitlength=1.5mm
    \drawline[AHnb=0](-10,-10)(10,10)(-10,10)(10,-10)
    \drawcurve[linecolor=Red,ATnb=3,AHnb=4](-10,-10)(10,10)(-10,10)(10,-10)
  }
  \put(100,19){ 
    \unitlength=20mm
    \drawline[AHnb=0](0.95,0.3)(-0.59,-0.8)(0,1)(0.59,-0.8)(-0.95,0.3)
    \drawcurve[linecolor=Red](0.95,0.3)(-0.59,-0.8)(0,1)(0.59,-0.8)(-0.95,0.3)
  }
\end{picture}
\end{center}

% Various macros

\begin{center}
\begin{picture}(120,60)(-60,-30)
% \put(-60,-30){\framebox(120,60){}}
  \drawline(-60,0)(60,0)
  \drawline(0,-30)(0,30)
  \drawrpolygon[polyangle=90,fillcolor=Blue](-9,5)(3,8)
  \drawrpolygon(-9,22)(8,7)
  \drawrpolygon(-9,22)(8,6)
  \drawrpolygon(-9,22)(8,5)
  \drawrpolygon[polyangle=18,arcradius=5](-27,7)(5,7)
  \drawrpolygon[fillcolor=Green](-27,23)(4,7)
  \put(-48,15){ 
    \unitlength=14mm
    \gasset{Nfill=y,fillcolor=Yellow,Nframe=y,arcradius=.1}
    \drawpolygon(0,1)(0.59,-0.8)(-0.95,0.3)(0.95,0.3)(-0.59,-0.8)
  }
  \drawline[AHLength=4,AHlength=0,AHangle=30,linewidth=.8](5,25)(15,15)(5,15)(15,5)
  \drawline[AHLength=4,AHlength=0,AHangle=30,linecolor=White](5,25)(15,15)(5,15)(15,5)
  \drawline[arcradius=1](17,25)(27,15)(17,15)(27,5)
  \drawline[linecolor=Red](30,10)(50,20)(25,25)(55,5)
  \drawline[AHLength=4,AHlength=0,AHangle=30,linewidth=.3](10,28)(35,28)
  \drawline[AHnb=0,linewidth=.9](10,28)(34.5,28)
  \drawline[AHnb=0,linewidth=.2,linecolor=White](10,28)(34.5,28)
  \drawcbezier[ATnb=1](-50,-5,-30,-5,-30,-25,-10,-25)
  \drawcbezier[AHnb=0,dash={1.5}0](-50,-25,-30,-25,-30,-5,-10,-5)
  \drawqbezier(31,-20,50,-20,50,-1)
  \drawqbezier[AHnb=0,linecolor=Green](31,-20,31,-1,50,-1)
  \drawcircle[Nfill=y,fillcolor=Yellow](40,-25,10)
  \drawrect[Nfill=y,fillcolor=Yellow,dash={1.5}0](5,-5,25,-15)
  \drawoval(15,-25,20,10,3)
\end{picture}
\end{center}

% Tricks: multiput and variables

\begin{center}
  \unitlength=0.7mm
\begin{picture}(60,46)(0,-3)
%   \put(0,-3){\framebox(60,46){}}
  {\gasset{AHnb=0}
    \drawline(0,0)(60,0)
    \drawline(0,20)(60,20)
    \drawline(0,40)(60,40)}
  \gasset{Nw=1.5,Nh=1.5,Nframe=n,Nfill=y}
  \multiput(0,0)(10,0){5}{%
    \node(A)(0,0){}\node(B)(5,20){}
    \drawedge(A,B){}
    }
  \multiput(10,20)(10,0){5}{%
    \node(A)(0,0){}\node(B)(5,20){}
    \drawedge(A,B){}
    }
\end{picture}
  \qquad
  \unitlength=1mm
\begin{picture}(50,30)(-5,0)
%   \put(-5,0){\framebox(50,30){}}
  \def\ax{5}\def\ay{5}\def\bx{35}\def\by{25}%
  \node(a)(\ax,\ay){$a$}\node(b)(\bx,\by){$b$}
  \drawedge(a,b){}
  \drawloop[loopdiam=6,loopangle=180](a){}
  \drawloop[loopdiam=6,loopangle=0](b){}

  \def\ax{5}\def\ay{25}\def\bx{35}\def\by{5}%
  \node(a)(\ax,\ay){$a$}\node(b)(\bx,\by){$b$}
  \drawedge(a,b){}
  \drawloop[loopdiam=6,loopangle=180](a){}
  \drawloop[loopdiam=6,loopangle=0](b){}
\end{picture}
\end{center}

% Compatibility with gastex 1.0

\begin{center}\compatiblegastexun
\begin{picture}(80,55)(-20,-15)
\thinlines
\put(-20,-15){\framebox(80,55){}}

\letstate A=(0,0)   \drawinitialstate(A){1}\drawfinalstate[b](A){}
\letstate B=(20,0)  \drawrepeatedstate(B){2}
\letstate C=(40,0)  \drawfinalstate(C){3}
\letstate D=(0,20)  \drawrepeatedstate(D){4}
\letstate E=(20,18) \drawstate(E){5}
\letstate[8,6] F=(40,20) \drawrepeatedstate(F){6}

\drawloop[b](B){$A,a,\alpha$}    \drawloop[l](D){$A,\varepsilon$}
{ \setpsdash(1) \drawloop(E){$B,b,\beta$} }
\drawloop[r](F){$B,\varepsilon$}

\drawtrans[r](A,B){$D,d,\delta$} \drawtrans[r](B,C){$D,\varepsilon$}
{ \settransdecal{1}
  \drawtrans(C,F){$F,f,\varphi$} \drawtrans(F,C){$G,g,\gamma$} }
\drawtrans(B,E){$\varepsilon$}   \drawtrans(E,F){$E,\varepsilon$}
{ \setprofcurve{0} \drawcurvedtrans[r](E,D){$F,\varepsilon$} }

\drawcurvedtrans(A,D){$C,c,\gamma$}
{ \setpsdash(3) \drawcurvedtrans(D,A){$C,\varepsilon$} }
{ \setprofcurve{-15} \drawcurvedtrans[r](F,D){$G_1,g_1,\gamma_1$} }
\end{picture}
\end{center}

\begin{center}\compatiblegastexun
\unitlength=1mm
\begin{picture}(90,30)(-5,-16)
\thinlines
\put(-5,-16){\framebox(90,30){}}

\setvertexdiam{6}
\letvertex A=(0,0)     \drawcircledvertex(A){$a$}
\letvertex B=(20,0)    \drawvertex(B){$b$}
\letvertex[9] C=(40,0) \drawcircledvertex(C){$c$}
\letvertex D=(60,0)    \drawcircledvertex(D){$d$}
\letvertex E=(80,0)    \drawcircledvertex(E){$e$}

\drawundirectededge(A,B){7}
\drawundirectededge(B,C){-11}
\drawundirectededge(C,D){13}
\drawundirectededge(D,E){2}

\setprofcurve{10}
\drawundirectedcurvededge(A,C){3}
\drawundirectedcurvededge(C,E){8}
\setprofcurve{-10}
\drawundirectedcurvededge[r](B,D){-5}

\drawundirectedloop[b](A){17}
\end{picture}
\end{center}

% Compatibility with pspictpg
\begin{center}\compatiblepspictpg
\begin{picture}(80,80)(-40,-40)
% \put(-40,-40){\framebox(80,80){}}
  \drawvector(-40,0)(40,0)
  \drawvector(0,-40)(0,40)
  \drawline(-30,-30)(30,30)
  \cbeziervector(-30,-20)(-30,0)(-10,0)(-10,20)
  {\setpsdash(3)\cbezier(-30,20)(-30,0)(-10,0)(-10,-20)}
  \qbeziervector(1,-20)(20,-20)(20,-1)
  \qbezier(1,-20)(1,-1)(20,-1)
  \drawcircle(10,30)(10)
  \put(-20,-30){\circle{10}}
  \put(25,5){\line(1,3){8}}
  \put(25,5){\vector(1,2){8}}
  \setpsgray{0.5}
  \drawdisk(-30,30)(10)
  \put(20,-30){\circle*{10}}
\end{picture}
\end{center}

\end{document}


